Free online chess problem of the day

Like chess? Come on daily, and try to solve these
free online chess games.
These free online chess problems should help you to
improve your chess strategies and tactics.

Each day I offer you a different
free online chess problem
with various difficulties. One day you will have to solve an
easy checkmate in 2 and the day after a very difficult free online chess
problem in 2 or a checkmate in 6.